Update dependency sass to ^1.50.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
sass	^1.49.11 -> ^1.50.0

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Release Notes

sass/dart-sass

v1.50.0

Compare Source

• @extend now treats [:where()][:where()] the same as :is().

Command Line Interface

• Closing the standard input stream will now cause the --watch command to stop
  running.

Embedded Sass

• Fix a bug where the JS embedded host crashed when invoking a legacy importer
  after resolving a relative filesystem import.

• Improve error messages when returning non-Object values from legacy
  importers.

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